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#!/usr/bin/env python3
#
# Copyright (C) 2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from sys import exit
from copy import deepcopy
from vyos.config import Config
from vyos import ConfigError
from vyos import vrf
# https://github.com/torvalds/linux/blob/master/Documentation/networking/vrf.txt
def sysctl(name, value):
os.system('sysctl -wq {}={}'.format(name, value))
def interfaces_with_vrf (match, effective):
matched = []
config = Config()
section = config.get_config_dict('interfaces', effective)
for type in section:
interfaces = section[type]
for name in interfaces:
interface = interfaces[name]
if 'vrf' in interface:
v = interface.get('vrf', '')
if v == match:
matched.append(name)
return matched
def get_config():
command = {
'bind':{},
'vrf':[],
'int': {}, # per vrf name list of interfaces which will have it
}
config = Config()
old = {}
new = {}
if config.exists_effective('vrf'):
old = deepcopy(config.get_config_dict('vrf', True))
if config.exists('vrf'):
new = deepcopy(config.get_config_dict('vrf', False))
integer = lambda _: '1' if _ else '0'
command['bind']['ipv4'] = integer('ipv4' not in new.get('disable-bind-to-all', {}))
command['bind']['ipv6'] = integer('ipv6' not in new.get('disable-bind-to-all', {}))
old_names = old.get('name', [])
new_names = new.get('name', [])
all_names = list(set(old_names) | set(new_names))
del_names = list(set(old_names).difference(new_names))
mod_names = list(set(old_names).intersection(new_names))
add_names = list(set(new_names).difference(old_names))
for name in all_names:
v = {
'name': name,
'action': 'miss',
'table': -1,
'check': -1,
}
if name in new_names:
v['table'] = new.get('name', {}).get(name, {}).get('table', -1)
v['check'] = old.get('name', {}).get(name, {}).get('table', -1)
if name in add_names:
v['action'] = 'add'
elif name in del_names:
v['action'] = 'delete'
elif name in mod_names:
if v['table'] != -1:
if v['check'] == -1:
v['action'] = 'add'
else:
v['action'] = 'modify'
command['vrf'].append(v)
for v in vrf.list_vrfs():
name = v['ifname']
command['int'][name] = interfaces_with_vrf(name,False)
return command
def verify(command):
for v in command['vrf']:
action = v['action']
name = v['name']
if action == 'modify' and v['table'] != v['check']:
raise ConfigError(f'set vrf name {name}: modification of vrf table is not supported yet')
if action == 'delete' and name in command['int']:
interface = ', '.join(command['int'][name])
if interface:
raise ConfigError(f'delete vrf name {name}: can not delete vrf as it is used on {interface}')
return command
def generate(command):
return command
def apply(command):
# set the default VRF global behaviour
sysctl('net.ipv4.tcp_l3mdev_accept', command['bind']['ipv4'])
sysctl('net.ipv4.udp_l3mdev_accept', command['bind']['ipv4'])
errors = []
for v in command['vrf']:
name = v['name']
action = v['action']
table = v['table']
errors.append(f'could not {action} vrf {name}')
if action == 'miss':
continue
if action == 'delete':
if os.system(f'sudo ip link delete dev {name}'):
continue
errors.pop()
continue
if action == 'modify':
# > uname -a
# Linux vyos 4.19.101-amd64-vyos #1 SMP Sun Feb 2 10:18:07 UTC 2020 x86_64 GNU/Linux
# > ip link add my-vrf type vrf table 100
# > ip link set my-vrf type vrf table 200
# RTNETLINK answers: Operation not supported
# so require to remove vrf and change all existing the interfaces
if os.system(f'sudo ip link delete dev {name}'):
continue
action = 'add'
if action == 'add':
commands = [
f'sudo ip link add {name} type vrf table {table}',
f'sudo ip link set dev {name} up',
f'sudo ip -4 rule add oif {name} lookup {table}',
f'sudo ip -4 rule add iif {name} lookup {table}',
f'sudo ip -6 rule add oif {name} lookup {table}',
f'sudo ip -6 rule add iif {name} lookup {table}',
]
for command in commands:
if os.system(command):
errors[-1] += ' ('+command+')'
continue
errors.pop()
if errors:
raise ConfigError(', '.join(errors))
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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